Drag Reduction in Turbulent Flow of Polymer Solutions PDF Download
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Author: Edward W. Merrill
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 294
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Book Description
Author: Edward W. Merrill
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 294
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Book Description
Author: A. Gyr
Publisher: Springer Science & Business Media
ISBN: 9401712956
Category : Technology & Engineering
Languages : en
Pages : 243
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Book Description
Drag Reduction of Turbulent Flows by Additives is the first treatment of the subject in book form. The treatment is extremely broad, ranging from physicochemical to hydromechanical aspects. The book shows how fibres, polymer molecules or surfactants at very dilute concentrations can reduce the drag of turbulent flow, leading to energy savings. The dilute solutions are considered in terms of the physical chemistry and rheology, and the properties of turbulent flows are presented in sufficient detail to explain the various interaction mechanisms. Audience: Those active in fundamental research on turbulence and those seeking to apply the effects described. Fluid mechanical engineers, rheologists, those interested in energy saving methods, or in any other application in which the flow rate in turbulent flow should be increased.
Author: Piotr Krzysztof Ptasinski
Publisher:
ISBN: 9789064648939
Category :
Languages : en
Pages : 126
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Book Description
Author: Edward W. Merrill
Publisher:
ISBN:
Category : Polyelectrolytes
Languages : en
Pages : 149
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Book Description
Polyelectrolytes as drag reducing agents were studied; abnormal effects occurred only in dilute aqueous solutions free of added electrolyte. Extensional flows of polyisobutylene observed by light scattering indicate greater elongation than in shear flow, but work is unfinished. Onset of drag reduction studied with 'monodisperse' poly cis isoprene solutions indicate time based hypothesis gives better correlation than length based hypothesis and that there may be two different onset levels.
Author: Robert William Paterson
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Robert W. Paterson
Publisher:
ISBN:
Category :
Languages : en
Pages : 197
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Book Description
The purpose of the study was to attempt to find an explanation for the phenomenon first reported by Toms in 1948 in which the addition of a few grams of a long chain polymer to a million cubic centimeters of a Newtonian solvent caused a large decrease in the turbulent pipe flow pressure drop while causing only a small increase in the laminar flow viscosity. This phenomenon, which has been observed to occur for a number of different polymers and solvents, is commonly referred to as 'drag reduction with dilute polymer solutions' or 'the Toms phenomenon'. (Author).
Author: Subbarao Chirravuri
Publisher: LAP Lambert Academic Publishing
ISBN: 9783844393842
Category :
Languages : en
Pages : 188
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Book Description
Processing and storage vessels in chemical industries are available in different shapes. The time required to drain these vessels is known as efflux time. Draining a liquid from a large storage vessel through an exit pipe is always associated with laminar flow in the tank and turbulent flow in the exit pipe depending on the physical properties of the liquid and the geometrical characteristics of the exit piping system. During draining, the liquid experiences friction and this friction is a measure of drag. The drag increases many fold when the flow transforms from laminar flow in the tank to turbulent flow in the exit pipe. Hence, drag reduction options are to be explored. The phenomenon of drag reduction by minute concentrations of polymer additives has been attempted for over sixty years, ever since its discovery by Toms. This book is focused on understanding drag reduction using water soluble polyacryl amide polymer solutions when a Newtonian liquid ( water in this case) is drained from a cylindrical storage vessel ( Where the flow is essentially laminar) through an exit piping system ( When the flow in the exit pipe is turbulent).
Author: Ralph C. Little
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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Book Description
The mechanism by which water-soluble polymers reduce hydrodynamic drag on solid surfaces was investigated by measurements of flow birefringence and of turbulent flow in pipes. Flow birefringence and flow field orientation of Polyox polymers in the molecular weight range from 200,000 to 6,000,000 showed that Polyox macromolecules continue to deform with increasing velocity gradient even after alignment with the flow field (at gradients in excess of 2000/sec). All solutions used were found to be Newtonian, with the exception of the AcrysolA-5 solutions. The flow data for Polyox solutions in a Pyrex pipe were examined in terms of Meyer's fluid property parameter and Elata's relaxation time hypothesis for the initiation of drag reduction. It was found that drag reduction in the Pyrex pipe was initiated at a value of the order of one-fifth that predicted by Elata's theory. Moreover, added salt (the solution being 0.3 molar in K2SO4) had no effect on the flow of Polyox Coagulant solutions even though the intrinsic viscosity (upon which Rouse relaxation times depend) was cut to slightly more than one-third of its value in the pure solvent. The unusually high values of Meyer's fluid property parameter observed at low concentrations suggests that adsorption on the Pyrex pipe walls may be playing a role in drag reduction. (Author).
Author: Hyunkook Shin
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 590
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Book Description
The object of this thesis was to investigate the drag reduction phenomenon in turbulent flow caused by random coiling macromolecules in 'dilute' solution. In particular, this thesis was concerned with the relationship of drag (or its reduction) to the size of the coils and their concentration, of two kinds of polymers differing significantly in chain flexibility: polyethylene oxide (PEO), the more flexible, and polyisobutylene (PIB), the less flexible. It was found that, within any given homologous polymer series, the ability of macromolecules to reduce drag improved drastically with increasing molecular weight. That is, the concentration of polymers in solution either in the absolute weight fraction or in the effective volume fraction required to yield a given percent drag reduction decreased rapidly with increasing molecular weight. It was further found that there always existed an optimum concentration for any given polymer system at which the observed drag reduction reached a maximum.
Author: C. Sinclair Wells
Publisher: Springer
ISBN: 1489955798
Category : Technology & Engineering
Languages : en
Pages : 497
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Book Description
